The rule, as he explains, is arbitrary. True, the designing agent inferred by ID theory is not directly observable, but neither are the elementary particles.
“Science,” says chemist Marcos Eberlin, “should appeal only to causes that are supported by data, supported by evidence.”
Clearly a naturalistic bias is at work here and imposes a limit on the spectrum of alternative explanations that is even considered to be permissible.
Khan’s unspoken corollary: anyone who expresses skepticism about evolution is an enemy of civilization.
As the biomimetics movement accelerates, scientists keep providing more and more examples of intelligent design in organisms great and small.